You could go from the computer headphone jack out to a PA now, just get the correct adapters.

1/8" stereo 'Y' adapter with RCA ends, a long good heavy RCA cable, and RCA-to-1/4" adapters at the other end into the PA .. good to go.

http://www.radioshack.com/product/index.jsp?productId=2103225

http://www.radioshack.com/product/index.jsp?productId=2062455


I do not work here, but the benefits are still awesome
Make your sound your own!